Oedalea yangi, Zeng & Lin & Yang, 2022

Zeng, Wei, Lin, Chen & Yang, Ding, 2022, Four new species of Oedalea (Diptera, Empidoidea, Hybotidae, Oedaleinae) from China with a key to south eastern Asian species, Zootaxa 5141 (6), pp. 553-567 : 563-566

6. Oedalea yangi sp. nov.

( Figs 22–28 )

Diagnosis. Palpus brown. Antenna 1.8 times as long as head, dark brown except scape blackish; first flagellomere 12.0 times longer than wide. Hairs on mesonotum dense, acr narrowly separated from dc on anterior 3/5. Pterostigma short and wide, trapezoidal, oblique at outer margin. Halter yellow.

Description. Male ( Fig. 22 ). Body length 3.85 mm, wing length 4.0 mm. Head ( Fig. 23 ) 0.7 mm, black with gray pollinosity. Eyes brownish black, contiguous on frons; clypeus shiny black. Hairs and bristles on head black, except lower occiput with yellow hairs. Ocellar tubercle distinct with 2 oc and 2 short posterior hairs; upper occiput with 5–6 slightly long postocular bristles slightly curved forward and inward. Antenna very long, 1.8 times as long as head, dark brown, except scape blackish; scape with black dorsal bristles; pedicel with circlet of black apical bristles; first flagellomere very elongated, 12.0 times longer than wide, short dark brown pubescent; stylus dark brown, nearly spine-like, about as long as basal width of first flagellomere. Proboscis 0.9 times as long as head height, dark brownish yellow with black hairs; palpus dark brown with black hairs.

Thorax subshiny black with thin gray pollinosity, except postalar calli dark yellow. Hairs on thorax short, pale yellow, bristles brownish yellow; hairs on mesonotum uniformly short and dense; ppn absent; acr and dc multiseriate, acr narrowly separated from dc, but posteriorly not separated; 2 npl (anterior one short, posterior one long and brown), 1 psa, 1 very long prsc dc; 3 pairs of sc. Legs yellow, except hind femur deeply yellow, hind tibia blackish except base and tarsi from apex of tarsomere 1 blackish onward. Fore tibia slightly thickened, hind tibia slightly curved. Hairs and bristles on legs blackish; coxae with dark yellow and brownish yellow hairs and bristles. Fore femur slightly thickened, 1.4 times as wide as mid femur; hind femur distinctly thickened, 3.1 times as wide as mid femur, with about four rows of black ventral spine-like bristles apically (outer av and pv rather long). Wing ( Fig. 24 ) nearly hyaline, slightly brownish above discal cell and M 1; dark brown pterostigma short and wide, trapezoidal, oblique at outer margin; veins dark brown, R 2+3 distinctly curved beneath pterostigma, M 2 complete. Squama dark yellow with dark yellow hairs. Halter yellow.

Abdomen apically weakly curved downward, somewhat shiny blackish with gray pollinosity. Hypopygium narrower than pregenital segments. Hairs and bristles on abdomen dark yellow, except those on hypopygium blackish. Hypopygium distinctly narrower than pregenital segments.

Terminalia ( Figs 25–28 ): Left and right cerci ( Fig. 25 ) digitiform, apically slightly narrowed. Basal bridge of epandrium ( Fig. 25 ) narrow; left and right epandrial lamellae ( Fig. 25 ) wide and not narrowed apically (dorsal view). Right epandrial lamella ( Fig. 27 ) trapezoidal (lateral view); right surstylus 1.5 times longer than wide, apically slightly curved ventrally. Left epandrial lamella ( Fig. 26 ) trapezoidal (lateral view); left surstylus 1.1 times longer than wide, widened apically with apical margin obliquely incised (lateral view). Hypandrium ( Fig. 28 ) much longer than wide, apically without lateral incision.

Female. Unknown.

Type material. HOLOTYPE ♂, Tibet, Linzhi, Pailong, Laoqiao [30°2′33″N, 95°0′35″E, 2177 m], 2019.IV.26, Qicheng Yang ( CAU).

Distribution. China (Tibet).

Remarks. The new species is somewhat similar to O. longicornis Frey , but may be separated from the latter by the following features: antenna 1.8 times as long as head, palpus brown to black. In O. longicornis , the antenna is 1.5 times as long as head height and the palpus is yellowish.

Etymology. The species is named after the collector, Mr. Qicheng Yang (Wuhan).

Figures

FIGURES 22–24. Oedalea yangi sp. nov. (male). 22. Adult habitus, lateral view; 23. Head, lateral view; 24. Wing.

FIGURES 25–28. Oedalea yangi sp. nov. (male). 25. Genitalia, dorsal view; 26. Left epandrial lamella, lateral view; 27. Right epandrial lamella, lateral view; 28. Hypandrium and phallus, ventral view. Abbreviations: see Material and methods.